I've used both springs and had excellent results. I also know a few people that had to go back to the factory hammer spring because of light primer hits. The double action was still better than the original with the Wolff trigger spring and factory hammer spring. The only way to tell how they will work in your pistol is to change them out and hit the range. Run a few hundred rounds through it, and if you have any misfires, go back to the factory hammer spring.